Malicious PDF — malware analysis report

Static analysis result for SHA-256 d540f527c7d3c6ef…

MALICIOUS

PDF

46.8 KB Created: 2020-08-09 07:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0919b94ccbacd47fed2bfcfed908ff0 SHA-1: e7c8635ba1cfd841ea0ae5d1c1e0f5a7660fbc79 SHA-256: d540f527c7d3c6ef623e03c0e0d79f5b58e5c1839fd033971f1b1bcfff6c344b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users through a seemingly innocuous document to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=mushaf+al+quran+indonesia+pdf
    • http://files.thechinahustle.us/uploads/1/3/0/7/130739918/7809409.pdf
    • http://files.relst-uhag66.com/uploads/1/3/1/4/131406849/9287563.pdf
    • http://files.apstockman.com/uploads/1/3/2/7/132712093/9849277.pdf
    • http://files.danyellscakesandcreations.com/uploads/1/3/1/3/131381612/rebegojirubuso_xegokazifududa_geriviziwir_kiwojarud.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/worerapujudog.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5753/files/64728392063.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65760981278.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/fisubokatebesaxujelupu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/bolens_38_inch_riding_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/67124142472.pdf
    • https://cdn.shopify.com/s/files/1/0436/9920/8346/files/from_odt_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/84937373057.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9574/files/dejanudenaxasofijasawut.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/ielts_band_score_chart_academic.pdf
    • https://cdn.shopify.com/s/files/1/0437/1932/7896/files/towaxavevok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602e.bin
f0fb41f077e5128c198207762d7029b16d07552cde6f17ca4ce0ec80f73d4a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602E 5260 bytes
font_01_sfnt_off0000720e.bin
63124e625cc47315f847e8ffe83e62c12d9f92d7a0e287c23c983757de581ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720E 11052 bytes
font_02_sfnt_off000096d3.bin
82393cdea758f60bffbc2967d0a5a2fc3cafb11add73a2e32079eb177ce972e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D3 16688 bytes

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